Add build CI

Author: PythonGermany

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Webserv build CI
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Build binary
+      uses: actions/checkout@v4
+      run: make
+    
+    - name: Upload binary to artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: webserv-binary
+        path: bin/webserv
+        if-no-files-found: error